Ions and Anions
Presentation
•
Chemistry
•
10th Grade
•
Hard
Joseph Anderson
FREE Resource
10 Slides • 2 Questions
1
Cations and Anions
2
Cations
Some atoms will lose electrons to achieve a stable electron configuration. A positive ion is formed to have an electron configuration similar to that of the nearest noble gas.
3
If the last energy level 1, 2 or 3, we must lose an electron
The last level must be complete
4
Na=1s2 2s2 2p6 3s1
Example
Sodium atom
5
Sodium ion (Na+)
+=1+
An ion with a positive charge is called a cation.
6
Multiple Choice
A potassium atom (K)
1s2 2s2 2p6 3s2 3p6 4s1
A potassium atom (K) loses 1 electron potassium ion (K+).
A potassium atom (K) loses 3 electron potassium ion (K3+).
A potassium atom (K) gain 1 electron potassium ion (K-).
A potassium atom (K) gain 2 electron potassium ion (K2-).
7
Anions
Some atoms will gain electrons to achieve a stable electron configuration. The negative ion that is formed also has an electron configuration similar to that of the nearest noble gas.
8
If the last energy level 5, 6 or 7, we must gina an electron
9
Fluorine atom
(F)=1s2 2s2 2p5
Example
10
fluoride ion (F−)
An ion with a negative charge is called an anion.
-=1-
11
Multiple Choice
A nitrogen atom (N)
1s2 2s2 2p3
A nitrogen atom (N) loses 3 electrons (N3+).
A nitrogen atom (N) gains 3 electrons (N3−).
A nitrogen atom (N) gains 3 electrons (N3+).
A nitrogen atom (N) gains 4 electrons (N4−).
12
done by: Ali and Salem
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